Filter out all -fsanitize= args when building libgetuid.so

Change-Id: Iaac0507c3f62c57a95a65972cba7575d04bd177e
Generally better to have DLLPUBLIC class with some DLLPRIVATE members

...than the other way around an implicitly DLLPRIVATE class with some DLLPUBLIC
members, so that any symbols implicitly added by the compiler have the right
visibility (e.g., RTTI as needed by -fsanitize=function).

Change-Id: I4898dee0ccc6fdc4e7e1f3fb19db94661563444f
-fsanitize=function

Change-Id: I29d648c45471e6d3503922ff00f7cd6491bb88f3